Liquibase Change set appears to be empty when executing update command

Before I explain my issue, I must declare that I'm a novice in Liquibase.

I'm trying to run liquibase update method in my Test class. My code reads the changeset file, acquires lock, reads from changelog and releases lock, but does not execute the changeset itself. Here's my structure:

Test class:
INFO 2/19/18 2:40 PM: liquibase: Successfully released change log lock
But my Database (tbreach_api_test) looks empty, with only 2 liquibase tables, in which the databasechangelog is empty.

I dived into Debug mode to see that the changeLog object in Liquibase class is initialized, but is empty.

What am I missing?